Broadband tunability of surface plasmon resonance in graphene-coating silica nanoparticles  

作　　者：史哲 杨阳 甘霖 李志远 

机构地区：[1]Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences [2]Key Laboratory of Micro-nano Measurement-Manipulation and Physics (Ministry of Education), Department of Physics,Beihang University

出　　处：《Chinese Physics B》2016年第5期393-399,共7页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nos.11204365 and 11434017);the National Basic Research Program of China(Grant No.2013CB632704)

摘　　要：Graphene decorated nanomaterials and nanostructures can potentially be used in military and medical science applications. In this article, we study the optical properties of a graphene wrapping silica core–shell spherical nanoparticle under illumination of external light by using the Mie theory. We find that the nanoparticle can exhibit surface plasmon resonance（SPR） that can be broadly tuned from mid infrared to near infrared via simply changing the geometric parameters. A simplified equivalent dielectric permittivity model is developed to better understand the physics of SPR, and the calculation results agree well qualitatively with the rigorous Mie theory. Both calculations suggest that a small radius of graphene wrapping nanoparticle with high Fermi level could move the SPR wavelength of graphene into the near infrared regime.Graphene decorated nanomaterials and nanostructures can potentially be used in military and medical science applications. In this article, we study the optical properties of a graphene wrapping silica core–shell spherical nanoparticle under illumination of external light by using the Mie theory. We find that the nanoparticle can exhibit surface plasmon resonance（SPR） that can be broadly tuned from mid infrared to near infrared via simply changing the geometric parameters. A simplified equivalent dielectric permittivity model is developed to better understand the physics of SPR, and the calculation results agree well qualitatively with the rigorous Mie theory. Both calculations suggest that a small radius of graphene wrapping nanoparticle with high Fermi level could move the SPR wavelength of graphene into the near infrared regime.

关 键 词：graphene core–shell nanoparticle surface plasmon resonance 

分 类 号：TB383.1[一般工业技术—材料科学与工程] O53[理学—等离子体物理]